“How about a windmill?”
Windmill powered aircraft used to be my favorite but you know a couple of solar cells for daytime flights and maybe 3 D cell batteries for night time and eclipses.
This is fantastic! Incredible! Unbelievable!
AND you should see the super sonic version, plus the hypersonic version is just around the corner, so to speak, just mind blowing what can be done with windmills - incredible!